/*
 * Copyright (c) 2010 Frederic Daoud
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
package com.fdaoud.rayures.extension;

import javax.servlet.ServletContext;
import net.sourceforge.stripes.config.Configuration;
import net.sourceforge.stripes.controller.DefaultObjectFactory;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

public class RayuresObjectFactory extends DefaultObjectFactory {

  private WebApplicationContext applicationContext;

  @Override
  public void init(Configuration configuration) throws Exception {
    super.init(configuration);
    ServletContext servletContext = configuration.getServletContext();
    applicationContext = WebApplicationContextUtils.getRequiredWebApplicationContext(servletContext);
  }

  @Override
  public <T> T newInstance(Class<T> type) {
    if (type == null) {
      throw new NullPointerException("Cannot create a new instance of a null type!");
    }
    String[] found = applicationContext.getBeanNamesForType(type);
    if (found == null || found.length == 0) {
      return super.newInstance(type);
    }
    if (found.length == 1) {
      return (T) applicationContext.getBean(found[0], type);
    }
    StringBuilder builder = new StringBuilder();
    for (String find : found) {
      builder.append(find).append(' ');
    }
    throw new RuntimeException("Found " + found.length + " beans for type: " + type.getName() + ": "
      + builder.toString());
  }
}

